I am having the same issue, all of the sudden videos crash Quicktime Player and no videos play in Quick Look.

I figured out two weeks ago that reinstalling the OS using the "Install OS X Mountain Lion" from the Mac App Store would fix it but the fix would only last a few days before I would have to run it again. Each time having to reinstall Java because I use Crahplan for off-site backsups.

After having the problem happen again an hour ago I found and read this very long thread looking for a solution.

In the past I've tried running every kind of repair and deleting every kind of cache file with no luck.

Based on this thread I decided to try the Security Update 2013-003, it restored my ability to play Quicktime files in Quicktime Player and in Quick Look from the Desktop.

Running this Security Update is much faster than a reinstall.

Thanks.

P.S. I will continue to follow this thread in the hopes of a permanent solution.

I'm 10.8.4 running a 2010 21" iMac with a 3TB internal hard drive. Only thing connected is an Apple USB keyboard and a Logitech Blutooth mouse. Nothing else is connected to this iMac.

I'm just following up as I've had this same problem (previously noted in this thread). I reinstalled the OS about a week ago and I have not installed the Security Update 2013-003. I have not had QuickTime or DVD Player crash since the reinstallation.

Previously, I reinstalled the OS and then applied the Security Update 2013-003 and although QuickTime briefly worked, it ended up crashing a few days later.

Again, so far, having NOT applied the security update, everything is working just fine.

@t1042: Hmm yes it seems so. I have not installed the security update yet, and have not had any problems. Did you have Skype installed at all? Maybe it's a combination of Skype and the security update. I wish I had more time to experiment and troubleshoot.

I currently have 10.8.4 with Skype 6.3, and have not installed the security update. I'm just waiting this out.

@XENiCraft: I do have Skype installed. I've had Skype installed for ages. I haven't launched Skype in a few months though. As of today, everything is still working fine without the security update installed.

On Sunday, Aug 18, I did reinstall OS X 10.8 and updated to 10.8.4, but did not install Security Update 2013-003. As of today, neither QuickTime nor DVD Palyer are experiencing crashes. If everthing is still alright in a couple of weeks, I will post again.

If these problems, on some Computers, are really the result of the Security Update, Apple needs to address the issue.

As I will be away from my computer for about a week, I thought that an update might be a good idea. I have been using the external drive, the one that had crashes, for eight days now without a crash of either QuickTime Player or DVD Player,

For sure it's something to do with /System/Library/Frameworks/QuickTime.framework. I used Pacifist to install just that portion of the SecUpd2013-003.pkg and got QuickTime Player working again.

I've just reinstalled SecUpd2013-003 and used ditto to copy /System/Library/Frameworks/QuickTime.framework to /System/Library/Frameworks.saved/QuickTime.framework. I plan to ditto the saved copy back to the original location if QuickTime dies on me again.

Thanks for contributing to this thread and thanks for the reference to Pacifist. I downloaded it and used it to explore the contents of SecUpd2013-003.dmg.

There was a lot more in their than I thought after reading Apple's explaination of the update. Since I have not installed that update since reinstalling OS X 10.8.4, I have none of those modifications installed on either of my startup drives.

I wish Apple would acknowlege this problem and come up with a solution. I do not feel comfortable with installing just some of the components of Security Update 2013-003, nor do I feel comfortable running my iMac without the Security Update installed as I am now doing on both my internal and external startup drives.

I have now been without crashes of either DVD Player or QuickTime Player since August 18. I am running OS X 10.8.4 without the Security Update. I am conviced that something in that Update, and not any hardware or other software issues, is the cause of the crashes.

I want to direct your attention to my latest post to this thread as well as some of the other posts since you last posted on Aug. 4.

Rather do a clean install, I reinstalled 10.8 and updated to 10.8.4, but without installing Security Update 2013-003 on Aug. 18 and have had not crashes since then. As a result, I am convinced that there is a bug in the SecUpd2013-003.pkg at least as it is applied to my and some other users system configuration.

Well QuickTime Player just died on me today. My plan to use ditto to restore a good copy of the directory didn't work. I managed to use Pacifist to install /System/Library/Frameworks, which contains QTKit.framework and QuickTime.framework, from the the update and got QuickTime Player working again.

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